code: def algo_unreg(args):
      name = args.name[0]
      meta = package_utils.get_algo_meta(name)
      if meta is None:
          print_error("builtin algorithms {} not found!".format(name))
          return
      if meta.is_builtin:
          print_error(
              "{} is provided by nni, can not be unregistered!".format(
                  name
              )
          )
          return
      package_utils.unregister_algo_meta(name)
      print_green("{} unregistered sucessfully!".format(name))
  
file_path: nni/nni/tools/nnictl/algo_management.py
imports: import importlib
  import json
  import nni
  from nni.tools import package_utils
  from .common_utils import print_error, print_green, get_yml_content
label_desc: Use image node_id 4 for calling a global function with example usage: algo_unreg(args) without return types